This question is regarding Sirrus 1850/968 Thermostatic Cartridge without Thermostat - SK1850-2

Sk1850-2

My shower pressure is good on cold as soon as I turn the heat up it looses power. I have serviced the cartridge but problem still exists. I tried your trick with the thermostat dipping in cold water then hot but the small piston did not come out of the wax. I have since fitted a new wax thermostat and the same fault still exists. Any other ideas to troubleshoot this problem
Asked 8 years ago by Paul
Have you checked the inlet filters?

The other thing you could try is giving the cartridge a flush out
This will take two!

Remove the cartridge

If your valve is recessed pack an old poly bag round the valve to divert the water into your Bath / shower tray then turn the hot and cold valves on one at a time and allow the water to flush through for about 15>20 seconds.

The person who is helping you should watch that the water is not going anywhere that is going to do any damage. Also they should watch that the amount of water coming from the hot and cold they should be roughly the same.

Answered 8 years ago by Anonymous

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